package flash.utils
{
	import flash.geom.Rectangle;

	public class ByteArrayUtil
	{
		
		/**
		 *	 将16进制字符转为16进制数字，然后写入字节并返回
		 * 
		 * @param hexStr	16进制字符， 以delim拆分；例：var str:String = "0A 32 FF";
		 * @param delim	拆分字符串的字符，默认为空格
		 * @return 
		 */
		[inline]
		public static function hexStringToByteArray(hexStr:String, delim:String = " "):ByteArray
		{
			if(delim == "")
				throw new ArgumentError("hexStringToByteArray()参数delim不能为空.");
			
			var bytes:ByteArray = new ByteArray();
			var arr:Array = hexStr.split(delim);
			var len:int = arr.length;
			
			for(var i:int = 0; i < len; i ++) 
			{
				bytes.writeByte(parseInt(arr[i], 16));
			}
			
			bytes.position = 0;
			
			return bytes;
		}
		
		/**
		 * 将字节数据转为16进制字符，并返回
		 * 
		 * @param bytes	需要转换的字节数据
		 * @param delim	拆分字符串的字符，默认为空格
		 * @return 
		 */
		[inline]
		public static function byteArrayToHexString(bytes:ByteArray, delim:String = " "):String
		{
			var str:String = "";
			var len:int = bytes.length;
			
			for(var i:int = 0; i < len; i ++)
			{
				//var tn:int = bytes[i];
				var s:String = bytes[i].toString(16).toUpperCase();
				
				s = s.length == 1 ? "0" + s : s;
				str += i == len - 1 ? s : s + delim;
			}
			
			return str;
		}
		
		/**
		 *	CRC16校验函数
		 * @param bytes
		 * @return	返回校验字节，2字节
		 */
		[inline]
		public static function CRC16Check(bytes:ByteArray):ByteArray
		{
			var crc:uint = 0xFFFF;
			
			var len:uint = bytes.length;
			for(var i:int = 0; i < len; i ++)
			{
				crc = crc ^ bytes[i];
				
				for(var j:int = 0; j < 8; j ++)
				{
					var t:uint = 0;
					t = crc & 0x0001;
					
					crc = crc >> 1;
					crc = crc & 0x7FFF;
					
					if(t > 0)
						crc = crc ^ 0xA001;
				}
			}
			
			var CRC:ByteArray = new ByteArray();
			CRC.endian = Endian.LITTLE_ENDIAN;
			CRC.writeShort(crc);
			
			return CRC;
		}
		
		/**
		 *	CRC32校验函数
		 * @param bytes
		 * @param CRC32Table
		 * @return 返回校验值
		 */		
		public static function CRC32Check(bytes:ByteArray, offset:uint = 0, length:uint = uint.MAX_VALUE):uint
		{
			var len:uint = length == uint.MAX_VALUE ? bytes.length : length;
			var ret:uint = 0xFFFFFFFF;
			
			for(var i:int = offset; i < len; i ++)
			{
				ret = CRC32TableData[(ret ^ bytes[i]) & 0xFF] ^ (ret >>> 8);
			}
			
			return ret ^ 0xFFFFFFFF;
		}
		
		/**
		 *	 CRC32校验码表
		 * 	@return 返回一个数组，长度为256
		 */		
		public static function CRC32Table():Vector.<uint>
		{
			var crc:uint;
			var i:uint,j:uint;
			
			var crc32:Vector.<uint> = new Vector.<uint>(256, true);
			
			for(i = 0; i < 256; i++)
			{
				crc = i;
				for(j = 0; j < 8; j++)
					crc = crc & 1 ? (crc >>> 1) ^ 0xEDB88320 : crc >>> 1;	//Poly = 0xedb88320 WinRAR Poly
				
				crc32[i] = crc;
			}
			
			return crc32;
		}
		
		/**
		 *	 CRC32校验码表，此表由CRC32Table()函数生成
		 */		
		public static var CRC32TableData:Vector.<Number> = new <Number>[
				0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
				0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
				0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
				0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
				0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
				0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
				0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
				0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
				0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
				0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
				0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
				0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
				0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
				0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
				0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
				0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
				0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
				0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
				0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
				0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
				0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
				0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
				0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
				0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
				0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
				0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
				0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
				0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
				0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
				0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
				0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
				0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
				0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
				0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
				0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
				0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
				0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
				0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
				0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
				0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
				0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
				0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
				0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
			];

	}
}